User admin: “Allow this user to”

When I use my keymaster account, and try to edit a user, there’s a part of the administration section that says, “Allow this user to” but there’s no form, text box or anything else to fill in after it. This line appears between “User Type” and “Custom Title”.

So what’s the point of the “Allow this user to” line? Looking at the code, it’s supposed to be for specifying specific user capabilities (like whether they can add posts, edit posts etc.) but it doesn’t seem to be fully functional yet. Is this expected?